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A large-scale study in Buenos Aires from December 29, 2020, to May 15, 2021, with 663,602 participants aged 60 and older who received Spunik V, the Oxford–AstraZeneca vaccine, or the Sinopharm BIBP vaccine observed an overall efficacy of 98% (95% CI, 95 – 99%) against COVID-19-related deaths. The study noted that the three vaccines showed a ...
In the UK, 15,121 health care workers from 104 hospitals who had tested negative for antibodies prior to the study, were followed by RT-PCR tests twice a week from 7 December 2020 to 5 February 2021, a study compared the positive results for the 90.7% vaccinated share of their cohort with the 9.3% unvaccinated share, and found that the Pfizer ...
Vaccine Initial effectiveness by severity of COVID-19 Study location Refs Asymptomatic Symptomatic Hospitalization Death Oxford–AstraZeneca
Pfizer and Moderna vaccines are both safe and have similar effectiveness at preventing COVID-19 illness. Clinical trial data when they were first released in December 2020 showed 95% efficacy for ...
The following is a roundup of some of the latest scientific studies on the novel coronavirus and efforts to find treatments and vaccines for COVID-19, the illness caused by the virus. Moderna Inc ...
Retrospective cohort study of the effectiveness of two Russian vaccines against the SARS-CoV-2 Delta variant in Moscow (June–July 2021) proved that EpiVacCorona, unlike Sputnik V, is an ineffective vaccine and therefore cannot protect against COVID-19. [4]
The experimental vaccine, which met the main trial goal, was being tested in more than 11,000 people aged 12 years and older. The shot showed superior efficacy in adults than the current vaccine ...
A vaccine is generally considered effective if the estimate is ≥50% with a >30% lower limit of the 95% confidence interval. [6] As of September 2021, no study on Sputnik Light reported confidence intervals, so it is not possible to know the accuracy of the estimates. Effectiveness is generally expected to slowly decrease over time. [7]